atmosphere to mmHg (atm → mmHg)
Unit ConverterConverting atmospheres to millimeters of mercury, 1atm is exactly 760mmHg by the standard-atmosphere definition.
What is it
The standard atmosphere is defined as 101,325Pa, conventionally equal to 760mmHg (torr). The mmHg survives from measuring pressure by the height of a mercury column and remains standard for blood pressure, barometric pressure and vacuum levels.
mmHg = atm × 760
How to use
- 1Enter the atmosphere (atm) value.
- 2See the mmHg (mmHg) result instantly.
- 3Switch units to convert again if needed.
Reference
| atm | mmHg |
|---|---|
| 0.5 | 380 |
| 1 | 760 |
| 2 | 1520 |
| 3 | 2280 |
| 5 | 3800 |
| 10 | 7600 |
Sources & standards
FAQ
How many mmHg is 1 atmosphere?
Exactly 760mmHg, from the definition of the standard atmosphere (101,325Pa).
How do I convert mmHg back to atm?
Compute atm = mmHg ÷ 760. For example, 380mmHg = 0.5atm.
Why is blood pressure measured in mmHg?
Early sphygmomanometers used a mercury column, and the unit stuck. A normal 120/80mmHg reading is about 0.158/0.105atm.
Is my input sent to a server?
No. Every conversion runs instantly inside your browser; the values you enter are never sent to a server or stored.